Abstract

We present a new implementation capable of producing two-dimensional (2D) superresolution (SR) imaging in a single exposure by aperture synthesis in digital lensless Fourier holography when using angular multiplexing provided by a vertical cavity surface-emitting laser source array. The system performs the recording in a single CCD snapshot of a multiplexed hologram coming from the incoherent addition of multiple subholograms, where each contains information about a different 2D spatial frequency band of the object’s spectrum. Thus, a set of nonoverlapping bandpass images of the input object can be recovered by Fourier transformation (FT) of the multiplexed hologram. The SR is obtained by coherent addition of the information contained in each bandpass image while generating an enlarged synthetic aperture. Experimental results demonstrate improvement in resolution and image quality.

(a) Single-exposure multiplexed hologram using five VCSEL sources (four off-axis sources plus one on-axis source), (b) its FT blocking the dc term to enhance image contrast, (c) magnified area marked with a white square in (b) showing that the five bandpass images are nonoverlapping, and (d)–(g) recovered bandpass images corresponding with off-axis illumination.